Interambulacra with up to 6 columns of approximately hexagonal plates, imbricating strongly adapically. Each with a large central primary tubercle that is perforate and non-crenulate; boss surrounded by a well marked areole, and around edges of plates there are secondary tubercles and granules.

Adapical interambulacral plates lacking primary tubercles.

Primary spines moderately long and slender, without cortex or ornament. Approximately half test diameter in length.

Similar to Archaeocidaris in most features but having more than four columns of interambulacral plates in each zone. Isolated plates of Archaeocidaris and Polytaxicidaris are indistinguishable. Deneechinus has more columns of interambulacral plates (8-12) in each zone, the interambulacral plates are smaller and more strongly imbricate, and the primary tubercles less prominent on the plates.